package com.itheima.reggie.web.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${img.path}")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     * @throws IOException
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        log.info("file:{}===>basePath:{}", file.toString(), basePath);
        //获取原始文件名称
        String originalFilename = file.getOriginalFilename();
        //获取文件后缀名称
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID生成32为的文件名称防止文件名称重复被覆盖
        String fileName = UUID.randomUUID().toString() + suffix;
        File dir = new File(basePath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        //文件复制到指定位置
        file.transferTo(new File(basePath + fileName));
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(HttpServletResponse response, String name) throws IOException {
        response.setContentType("image/jpeg");
        try (
                ServletOutputStream sos = response.getOutputStream();
                FileInputStream fis = new FileInputStream(basePath + name)
        ) {
            byte[] bytes = new byte[1024];
            int len = 0;
            while ((len = fis.read(bytes)) != -1) {
                sos.write(bytes, 0, len);
                sos.flush();
            }
        }


    }
}
